On Τετ, 2016-06-22 at 21:15 -0400, Haines Brown wrote: > There was no response to the question of my original post. I assume that > this was because it was too open ended. So I'll be more specific. > > I'm running debian Wheezy with a SignaLink USB sound card and fldigi > software. The transmitter is a K3 tuned to 14.070, TX DATA mode USB. My > computer uses PulseAudio as default. Alsamixer also sees the presence of > SignaLink's USB Audio CODEC, which is un-muted and at 84%. > > The SignaLink USB instructions tell me to make sure the software's > transmit and receive audio card is set to USB Audio CODEC. I go to > fldigi, Configure, Soundcard. Although PulseAudio is present on the > computer, not wishing to use PulseAudio for fldigi, I have selected > PortAudio. I assume I can do this. Am I wrong?
No you are not wrong... though I can not understand why you want to do
that. Portaudio will use ALSA which will redirect you through
Pulseaudio!!!
>
> PortAudio does not offer an option to choose the Transmit and Receive
> audio card, but instead the Capture and Playback card. I set PortAudio
> Capture to the SignaLink's USB Audio CODEC card. But the fldigi
> PortAudio Playback does have that option. Its options are Xonar DX (my
> computer's sound card) HDA NNvidia (motherboard audio chip), iec958,
> spdif (a cable?), pulse (PulseAudio?) and default (my computer's Xonar
> sound card?). USB Audio CODEC is not a choice. Should it be? Should I
> instead use iec958?
Make sure you have installed libportaudio packages.
>
> Pavucontrol sees "ALSA Plugin [fldigi]" for ALSA Capture under Recording
> and sees PCM2904 Audio Codec Analog Stereo among Output
> Devices. Question: shouldn't what pavucontol sees and the values it sets
> be irrelevant?
See above!!!
>
> And the fldigi waterfall is strange. Fldigi is set to PSK31 at
> 14070.000. The waterfall sees noise only in a band at its center
> (14071.240 to 14071.716) and at its extreme left edge (14070.041). While
> the middle region has nothing that looks like signals (unless it itself
> is a broadband signal), the left edge looks as though it is close to the
> IM distortion of a signal just out of range. Although the central region
> has no visible PSK31 signals and I hear no PSK31 warble, it and the
> extreme left produce garbage text ("e S tite ate oee o e too="), whether
> I set the demodulation for frequency or phase shift. The only effect
> changing the demodulation is that with RTTY, the garbage is upper case.
>
> Please help.
>
> Haines Brown KB1GRM
>
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